president obama along with massachusetts governor duval patrick and boston mayor thomas menino are expected to speak. a number of dignitaries, including as you said mitt romney, the former massachusetts governor and long-time boston resident will be in attendance. >>> now, on to the investigation, in addition to what all is going on here as far as the memorial goes, it was a day yesterday of considerable breakthroughs. physical evidence that's been found at the sight of the blast includes parts of the bomb or bombs, parts of the black nylon bag or dark nylon bag that was used to contain the bombs as well as shrapnel and wiring from inside the bombs that made them go off and do such devastation. and there also is visual evidence and considerable visual evidence as you see in a google earth animation. one of the key surveillance cameras was apparently on the lord & taylor score strictly across the street from the second blast where authorities believe they got one of many angles of a man believed to be about six feet tall in a white or off white baseball cap who put down a bag around the seco